Sanborn air compressor parts needed

Question

I need to find a connecting rod for my Sanborn air compressor likely manufactured in the 80's. I have been told by Coleman & MAT (the company that took over Sanborn) that the part is obsolete. Does anyone know of a company that might still have some stock of older parts for Sanborn. Specifically, I need a connecting rod part# 047-0008. It is out of a 3 hp (electric) two cylinder upright pump. Any help much appreciated. There are no Sanborn numbers listed on the compressor/tank itself so I don't have any model numbers